<HTML>
<BODY BGCOLOR="white">
<PRE>
<FONT color="green">001</FONT>    /**<a name="line.1"></a>
<FONT color="green">002</FONT>     *<a name="line.2"></a>
<FONT color="green">003</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.3"></a>
<FONT color="green">004</FONT>     * contributor license agreements.  See the NOTICE file distributed with<a name="line.4"></a>
<FONT color="green">005</FONT>     * this work for additional information regarding copyright ownership.<a name="line.5"></a>
<FONT color="green">006</FONT>     * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.6"></a>
<FONT color="green">007</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.7"></a>
<FONT color="green">008</FONT>     * the License.  You may obtain a copy of the License at<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     *     http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<FONT color="green">011</FONT>     *<a name="line.11"></a>
<FONT color="green">012</FONT>     *  Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<FONT color="green">013</FONT>     *  distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<FONT color="green">014</FONT>     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<FONT color="green">015</FONT>     *  See the License for the specific language governing permissions and<a name="line.15"></a>
<FONT color="green">016</FONT>     *  limitations under the License.<a name="line.16"></a>
<FONT color="green">017</FONT>     */<a name="line.17"></a>
<FONT color="green">018</FONT>    package org.apache.commons.dbcp.managed;<a name="line.18"></a>
<FONT color="green">019</FONT>    <a name="line.19"></a>
<FONT color="green">020</FONT>    import javax.transaction.RollbackException;<a name="line.20"></a>
<FONT color="green">021</FONT>    import javax.transaction.Status;<a name="line.21"></a>
<FONT color="green">022</FONT>    import javax.transaction.Synchronization;<a name="line.22"></a>
<FONT color="green">023</FONT>    import javax.transaction.SystemException;<a name="line.23"></a>
<FONT color="green">024</FONT>    import javax.transaction.Transaction;<a name="line.24"></a>
<FONT color="green">025</FONT>    import javax.transaction.xa.XAResource;<a name="line.25"></a>
<FONT color="green">026</FONT>    import java.sql.Connection;<a name="line.26"></a>
<FONT color="green">027</FONT>    import java.sql.SQLException;<a name="line.27"></a>
<FONT color="green">028</FONT>    import java.lang.ref.WeakReference;<a name="line.28"></a>
<FONT color="green">029</FONT>    <a name="line.29"></a>
<FONT color="green">030</FONT>    /**<a name="line.30"></a>
<FONT color="green">031</FONT>     * TransactionContext represents the association between a single XAConnectionFactory and a Transaction.<a name="line.31"></a>
<FONT color="green">032</FONT>     * This context contains a single shared connection which should be used by all ManagedConnections for<a name="line.32"></a>
<FONT color="green">033</FONT>     * the XAConnectionFactory, the ability to listen for the transaction completion event, and a method<a name="line.33"></a>
<FONT color="green">034</FONT>     * to check the status of the transaction.<a name="line.34"></a>
<FONT color="green">035</FONT>     *<a name="line.35"></a>
<FONT color="green">036</FONT>     * @author Dain Sundstrom<a name="line.36"></a>
<FONT color="green">037</FONT>     * @version $Revision$<a name="line.37"></a>
<FONT color="green">038</FONT>     */<a name="line.38"></a>
<FONT color="green">039</FONT>    public class TransactionContext {<a name="line.39"></a>
<FONT color="green">040</FONT>        private final TransactionRegistry transactionRegistry;<a name="line.40"></a>
<FONT color="green">041</FONT>        private final WeakReference transactionRef;<a name="line.41"></a>
<FONT color="green">042</FONT>        private Connection sharedConnection;<a name="line.42"></a>
<FONT color="green">043</FONT>    <a name="line.43"></a>
<FONT color="green">044</FONT>        /**<a name="line.44"></a>
<FONT color="green">045</FONT>         * Creates a TransactionContext for the specified Transaction and TransactionRegistry.  The<a name="line.45"></a>
<FONT color="green">046</FONT>         * TransactionRegistry is used to obtain the XAResource for the shared connection when it is<a name="line.46"></a>
<FONT color="green">047</FONT>         * enlisted in the transaction.<a name="line.47"></a>
<FONT color="green">048</FONT>         *<a name="line.48"></a>
<FONT color="green">049</FONT>         * @param transactionRegistry the TransactionRegistry used to obtain the XAResource for the<a name="line.49"></a>
<FONT color="green">050</FONT>         * shared connection<a name="line.50"></a>
<FONT color="green">051</FONT>         * @param transaction the transaction<a name="line.51"></a>
<FONT color="green">052</FONT>         */<a name="line.52"></a>
<FONT color="green">053</FONT>        public TransactionContext(TransactionRegistry transactionRegistry, Transaction transaction) {<a name="line.53"></a>
<FONT color="green">054</FONT>            if (transactionRegistry == null) throw new NullPointerException("transactionRegistry is null");<a name="line.54"></a>
<FONT color="green">055</FONT>            if (transaction == null) throw new NullPointerException("transaction is null");<a name="line.55"></a>
<FONT color="green">056</FONT>            this.transactionRegistry = transactionRegistry;<a name="line.56"></a>
<FONT color="green">057</FONT>            this.transactionRef = new WeakReference(transaction);<a name="line.57"></a>
<FONT color="green">058</FONT>        }<a name="line.58"></a>
<FONT color="green">059</FONT>    <a name="line.59"></a>
<FONT color="green">060</FONT>        /**<a name="line.60"></a>
<FONT color="green">061</FONT>         * Gets the connection shared by all ManagedConnections in the transaction.  Specifically,<a name="line.61"></a>
<FONT color="green">062</FONT>         * connection using the same XAConnectionFactory from which the TransactionRegistry was<a name="line.62"></a>
<FONT color="green">063</FONT>         * obtained.<a name="line.63"></a>
<FONT color="green">064</FONT>         * @return the shared connection for this transaction<a name="line.64"></a>
<FONT color="green">065</FONT>         */<a name="line.65"></a>
<FONT color="green">066</FONT>        public Connection getSharedConnection() {<a name="line.66"></a>
<FONT color="green">067</FONT>            return sharedConnection;<a name="line.67"></a>
<FONT color="green">068</FONT>        }<a name="line.68"></a>
<FONT color="green">069</FONT>    <a name="line.69"></a>
<FONT color="green">070</FONT>        /**<a name="line.70"></a>
<FONT color="green">071</FONT>         * Sets the shared connection for this transaction.  The shared connection is enlisted<a name="line.71"></a>
<FONT color="green">072</FONT>         * in the transaction.<a name="line.72"></a>
<FONT color="green">073</FONT>         *<a name="line.73"></a>
<FONT color="green">074</FONT>         * @param sharedConnection the shared connection<a name="line.74"></a>
<FONT color="green">075</FONT>         * @throws SQLException if a shared connection is already set, if XAResource for the connection<a name="line.75"></a>
<FONT color="green">076</FONT>         * could not be found in the transaction registry, or if there was a problem enlisting the<a name="line.76"></a>
<FONT color="green">077</FONT>         * connection in the transaction<a name="line.77"></a>
<FONT color="green">078</FONT>         */<a name="line.78"></a>
<FONT color="green">079</FONT>        public void setSharedConnection(Connection sharedConnection) throws SQLException {<a name="line.79"></a>
<FONT color="green">080</FONT>            if (this.sharedConnection != null) {<a name="line.80"></a>
<FONT color="green">081</FONT>                throw new IllegalStateException("A shared connection is alredy set");<a name="line.81"></a>
<FONT color="green">082</FONT>            }<a name="line.82"></a>
<FONT color="green">083</FONT>    <a name="line.83"></a>
<FONT color="green">084</FONT>            // This is the first use of the connection in this transaction, so we must<a name="line.84"></a>
<FONT color="green">085</FONT>            // enlist it in the transaction<a name="line.85"></a>
<FONT color="green">086</FONT>            Transaction transaction = getTransaction();<a name="line.86"></a>
<FONT color="green">087</FONT>            try {<a name="line.87"></a>
<FONT color="green">088</FONT>                XAResource xaResource = transactionRegistry.getXAResource(sharedConnection);<a name="line.88"></a>
<FONT color="green">089</FONT>                transaction.enlistResource(xaResource);<a name="line.89"></a>
<FONT color="green">090</FONT>            } catch (RollbackException e) {<a name="line.90"></a>
<FONT color="green">091</FONT>                // transaction was rolled back... proceed as if there never was a transaction<a name="line.91"></a>
<FONT color="green">092</FONT>            } catch (SystemException e) {<a name="line.92"></a>
<FONT color="green">093</FONT>                throw (SQLException) new SQLException("Unable to enlist connection the transaction").initCause(e);<a name="line.93"></a>
<FONT color="green">094</FONT>            }<a name="line.94"></a>
<FONT color="green">095</FONT>    <a name="line.95"></a>
<FONT color="green">096</FONT>            this.sharedConnection = sharedConnection;<a name="line.96"></a>
<FONT color="green">097</FONT>        }<a name="line.97"></a>
<FONT color="green">098</FONT>    <a name="line.98"></a>
<FONT color="green">099</FONT>        /**<a name="line.99"></a>
<FONT color="green">100</FONT>         * Adds a listener for transaction completion events.<a name="line.100"></a>
<FONT color="green">101</FONT>         *<a name="line.101"></a>
<FONT color="green">102</FONT>         * @param listener the listener to add<a name="line.102"></a>
<FONT color="green">103</FONT>         * @throws SQLException if a problem occurs adding the listener to the transaction<a name="line.103"></a>
<FONT color="green">104</FONT>         */<a name="line.104"></a>
<FONT color="green">105</FONT>        public void addTransactionContextListener(final TransactionContextListener listener) throws SQLException {<a name="line.105"></a>
<FONT color="green">106</FONT>            try {<a name="line.106"></a>
<FONT color="green">107</FONT>                getTransaction().registerSynchronization(new Synchronization() {<a name="line.107"></a>
<FONT color="green">108</FONT>                    public void beforeCompletion() {<a name="line.108"></a>
<FONT color="green">109</FONT>                    }<a name="line.109"></a>
<FONT color="green">110</FONT>    <a name="line.110"></a>
<FONT color="green">111</FONT>                    public void afterCompletion(int status) {<a name="line.111"></a>
<FONT color="green">112</FONT>                        listener.afterCompletion(TransactionContext.this, status == Status.STATUS_COMMITTED);<a name="line.112"></a>
<FONT color="green">113</FONT>                    }<a name="line.113"></a>
<FONT color="green">114</FONT>                });<a name="line.114"></a>
<FONT color="green">115</FONT>            } catch (RollbackException e) {<a name="line.115"></a>
<FONT color="green">116</FONT>                // JTA spec doesn't let us register with a transaction marked rollback only<a name="line.116"></a>
<FONT color="green">117</FONT>                // just ignore this and the tx state will be cleared another way.<a name="line.117"></a>
<FONT color="green">118</FONT>            } catch (Exception e) {<a name="line.118"></a>
<FONT color="green">119</FONT>                throw (SQLException) new SQLException("Unable to register transaction context listener").initCause(e);<a name="line.119"></a>
<FONT color="green">120</FONT>            }<a name="line.120"></a>
<FONT color="green">121</FONT>        }<a name="line.121"></a>
<FONT color="green">122</FONT>    <a name="line.122"></a>
<FONT color="green">123</FONT>        /**<a name="line.123"></a>
<FONT color="green">124</FONT>         * True if the transaction is active or marked for rollback only.<a name="line.124"></a>
<FONT color="green">125</FONT>         * @return true if the transaction is active or marked for rollback only; false otherwise<a name="line.125"></a>
<FONT color="green">126</FONT>         * @throws SQLException if a problem occurs obtaining the transaction status<a name="line.126"></a>
<FONT color="green">127</FONT>         */<a name="line.127"></a>
<FONT color="green">128</FONT>        public boolean isActive() throws SQLException {<a name="line.128"></a>
<FONT color="green">129</FONT>            try {<a name="line.129"></a>
<FONT color="green">130</FONT>                Transaction transaction = (Transaction) this.transactionRef.get();<a name="line.130"></a>
<FONT color="green">131</FONT>                if (transaction == null) {<a name="line.131"></a>
<FONT color="green">132</FONT>                    return false;<a name="line.132"></a>
<FONT color="green">133</FONT>                }<a name="line.133"></a>
<FONT color="green">134</FONT>                int status = transaction.getStatus();<a name="line.134"></a>
<FONT color="green">135</FONT>                return status == Status.STATUS_ACTIVE || status == Status.STATUS_MARKED_ROLLBACK;<a name="line.135"></a>
<FONT color="green">136</FONT>            } catch (SystemException e) {<a name="line.136"></a>
<FONT color="green">137</FONT>                throw (SQLException) new SQLException("Unable to get transaction status").initCause(e);<a name="line.137"></a>
<FONT color="green">138</FONT>            }<a name="line.138"></a>
<FONT color="green">139</FONT>        }<a name="line.139"></a>
<FONT color="green">140</FONT>    <a name="line.140"></a>
<FONT color="green">141</FONT>        private Transaction getTransaction() throws SQLException {<a name="line.141"></a>
<FONT color="green">142</FONT>            Transaction transaction = (Transaction) this.transactionRef.get();<a name="line.142"></a>
<FONT color="green">143</FONT>            if (transaction == null) {<a name="line.143"></a>
<FONT color="green">144</FONT>                throw new SQLException("Unable to enlist connection because the transaction has been garbage collected");<a name="line.144"></a>
<FONT color="green">145</FONT>            }<a name="line.145"></a>
<FONT color="green">146</FONT>            return transaction;<a name="line.146"></a>
<FONT color="green">147</FONT>        }<a name="line.147"></a>
<FONT color="green">148</FONT>    }<a name="line.148"></a>




























































</PRE>
</BODY>
</HTML>
